JP2008249270A - Ice grain injection device, and ice making machine used for ice grain injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent accumulation of powder ice on a conveying path and prevent conveyed ice grains from clogging. <P>SOLUTION: The ice making machine 2 used for the ice grain injection device 1 for blasting the ice grains C3 on a surface of a work together with high-pressure water W, comprises a refrigeration drum 22 for forming an ice layer C2 on an inner wall 22a by freezing ice making water C1 sprinkled from a water sprinkling device 21, a blade 6 having a sawtooth ice crushing blade 61 for producing the ice grains C3 by chipping the ice layer C2 with the ice crushing blade 61, and a rotation device 23 for rotating the blade 6 along the inner wall 22a while fixing on the inner wall 22a. The ice crushing blade 61 is formed to have a blade edge rake angle from -10° to -55°. The device further includes a cleaning nozzle 8 for cleaning the powder ice accumulated on the blade 6, and a scraper 31 for eliminating the powder ice accumulated on an inner wall 3c of a funnel 3 for collecting the ice grains C3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice grain ejector and an ice making machine used for the ice grain ejecting apparatus, and more particularly to an ice grain ejecting apparatus capable of preventing clogging of ice grains in a transport path and an ice making machine used for the ice grain ejecting apparatus. .

In an ice grain jetting device that performs blasting and deburring by blasting ice grains with high-pressure water on the surface of the workpiece, ice grains (flake ice, ice pieces) are made by an internal drum type flake ice making machine ( For example, Patent Documents 1 and 2).
That is, when a certain amount of ice making water is sprayed on the inner wall of the freezing drum through which the refrigerant circulates, the ice making water instantly freezes on the inner wall. Frozen ice is scraped off by a blade that rotates along the inner wall, producing flake ice. The flake ice is collected by a funnel installed under the ice making machine, sucked into the transfer hose by the ejector action of the high pressure water, mixed with the high pressure water, and sprayed toward the workpiece.

JP 2006-102824 A JP 2003-56953 A

However, when the ice layer formed on the inner wall of the drum is scraped off with a blade to produce flake ice with a thickness of about 0.8 mm, fine powder ice (powder-like ice pieces that easily adhere and accumulate) is also generated. . Since this powdered ice (powder snow) is finer than flake ice (ice grains), it adheres to and accumulates on the blade surface and funnel inner surface, and falls as a lump when its own weight exceeds the frictional resistance.
When the fallen lump of powdered ice is larger than the outlet of the funnel or the inner diameter of the transfer hose, the powdered ice is blocked and the powdered ice (powdered snow) deposit grows to a length of 3 to 6 cm and a thickness of 1 to 2 cm. There was a thing. When such powdered ice deposits are blocked in the ice particle conveyance path, there is a problem that the ice particles are not smoothly conveyed.
For this reason, it has been demanded to reduce powdered ice (powder snow) that tends to form simultaneously when flake ice is generated, or to drop the powdered ice deposited on the blade or the like before it becomes large.

  Accordingly, an object of the present invention is to provide an ice grain injection device that can prevent clogging of ice particles in the transport path and an ice maker used for the ice particle injection device in order to solve the above-described problems. To do.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an ice making machine for use in an ice grain spraying device for blasting ice grains to the surface of a workpiece together with high-pressure water, and freezes the ice making water sprinkled from the water sprinkler. A freezing drum that forms an ice layer on the inner wall, a saw-toothed ice breaking blade, a blade that scrapes off the ice layer with the ice breaking blade to produce the ice particles, and this blade is applied to the inner wall A rotating device that rotates along the inner wall in a state, wherein the ice breaking blade is formed with a rake angle of the blade edge in a range of −10 ° to −55 °.

Thus, this invention suppresses generation | occurrence | production of powdered ice by making the rake angle of the blade edge | tip of the said ice breaking blade into the range of -10 degrees to -55 degrees.
Usually, the rake angle of the blade edge in the blade of the ice making machine is 0 to the plus side. However, when the experiment is performed by setting the rake angle of the blade edge from 0 to the minus side, the generation of powdered ice is gradually suppressed as it shifts to the minus side. This is thought to be due to various factors acting in a complex manner. One factor is that the cutting edge acts like a bite in the process of generating ice particles by the ice-breaking blade and cuts the ice layer with the cutting edge. It is conceivable that an element that peels off (peeling) and an element that acts like a icebreaker and pushes and breaks the ice layer with the blade edge (breaking) are mixed. For this reason, when the rake angle of the blade edge is swung to the minus side, it is presumed that the factor of “breaking” increases and powder ice (powder snow) decreases. On the other hand, when the rake angle exceeds −55 °, the element of “peeling” is excessively reduced and the ice making efficiency is lowered.

The invention according to claim 2 is the ice making machine according to claim 1, characterized in that a cleaning nozzle for injecting cleaning water is arranged toward the blade.
According to the invention which concerns on Claim 2, the powdered ice which accumulates on a braid | blade can be removed by injecting washing water toward the front and back surfaces of a braid | blade. That is, when the ice making machine is continuously operated, the powdered ice gradually accumulated on the blades is removed by washing with cleaning water. For example, by cleaning the blades before and after the operation cycle, the operation cycle The accumulation of powdered ice inside can be reduced.

The invention according to claim 3 is the cleaning machine according to claim 2, wherein when the blade rotates, the rotational position of the blade is detected, and the blade reaches a predetermined cleaning position. The cleaning water is jetted from the cleaning nozzle toward the blade.
According to the invention of claim 3, since it is detected that the rotating blade reaches the predetermined cleaning position and the cleaning water is sprayed toward the cleaning position, it is possible to efficiently and reliably perform the cleaning. .

  The invention according to claim 4 is an ice grain spraying device having the ice making machine according to any one of claims 1 to 3, comprising a funnel for collecting ice grains produced by the ice making machine, and an inner wall of the funnel The scraper is brought into contact with and held, and the scraper is rotated along the inner wall of the funnel using the rotational force of the rotating device.

  According to the fourth aspect of the present invention, the powdered ice deposited on the inner wall of the funnel can be reliably removed by bringing the scraper into contact with the inner wall of the funnel and rotating along the inner wall. That is, when the ice making machine is continuously operated, powdered ice gradually accumulates on the funnel, but by removing the powdered ice by the scraper, the accumulation of powdered ice during the operation cycle can be reduced.

  The ice grain ejector according to the present invention and the ice making machine used for the ice grain ejector can prevent clogging of ice grains in the transport path.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the drawings to be referred to, FIG. 1 is a partial cross-sectional view showing an overall configuration of an ice grain injection device according to an embodiment of the present invention, and FIG. 2 is a schematic plan view showing the inside of a drum of an ice making machine according to an embodiment of the present invention. FIG. In this figure, the direction of gravity is referred to as “vertical direction” as appropriate with respect to the state in which the ice grain spray device is used (the vertical direction in FIG. 1).

  As shown in FIG. 1, an ice grain injection device 1 according to an embodiment of the present invention includes an ice making machine 2 that produces ice grains, a funnel 3 that collects ice grains C3 produced by the ice making machine 2, and a funnel 3 The suction hose 4 that is a transport path for transporting the ice particles C3 collected in step 1 to the high-pressure water spray nozzle 5, and the high-pressure water spray nozzle that sprays and blasts the ice particles C3 together with the high-pressure water W onto the surface of the workpiece (not shown). 5 is provided.

  The ice making machine 2 has a freezing drum 22 that freezes the ice making water C1 sprinkled from the water sprinkler 21 to form an ice layer C2 on the inner wall 22a, and a saw-toothed ice breaking blade 61, and the ice breaking blade 61 scrapes the ice layer. A blade 6 for producing ice particles C3 by dropping, a cleaning nozzle 8 for cleaning powder ice (powder snow) adhering to the blade 6, and a rotating device for rotating the blade 6 along the inner wall 22a while being applied to the inner wall 22a 23.

As shown in FIG. 1, the water sprinkler 21 is disposed on the inner upper portion of the freezing drum 22, and includes a tank 21a for storing the ice making water C1, an introduction pipe 21b for introducing the ice making water C1 into the tank 21a, and a tank 21a. A plurality of sprinkling pipes 21c (see FIG. 2) for spraying ice-making water C1 onto the inner wall 22a of the drum are provided. And the tank 21a is connected with the rotating shaft 23c of the rotating device 23 so that the ice making water C1 can be uniformly sprinkled while rotating.
With this configuration, the ice-making water C1 sprayed on the inner wall 22a of the refrigeration drum 22 is instantaneously cooled to form an ice layer C2 on the inner wall 22a of the refrigeration drum 22.

  In the freezing drum 22, a refrigerant evaporator 22b constituting a circulating refrigerating cycle (not shown) is spirally wound along the inner wall 22a of the freezing drum 22, and is insulated by a heat insulating material 22c. The ice layer C2 formed on the inner wall 22a of the freezing drum 22 is scraped off by the blade 6 to become ice particles C3 and falls downward.

The configuration of the blade 6 will be described with reference to FIGS. 3A is a perspective view showing an appearance of a blade according to an embodiment of the present invention, and FIG. 3B is a partially enlarged view of an ice breaking blade. 4A is a front view of the blade, and FIG. 4B is a right side view. An arrow (R) in the figure indicates the direction of travel (rotation) of the blade.
In addition, since these figures are shown schematically, the size and positional relationship such as an angle may be exaggerated for convenience of explanation.

  The ice breaking blades 61 formed on the blade 6 are formed side by side along the vertical direction of the blade 6 as shown in FIG. An old rake face P1 is formed on the front side of the blade 6 in the traveling direction R.

As shown in FIG. 3B, the cutting edge of the ice breaking blade 61 has an old cutting edge angle θ formed by the cutting edge S1 and the cutting edge S2 formed on the old rake face P1 so that the tip portion has an acute angle of 45 °. (See also FIG. 4 (a)).
And it cut | disconnects so that the cutting edge S0 may be scraped toward the nose n from the cutting edge S3 formed orthogonally to the cutting edge S2, and the new rake face P2 is formed. In this way, the cutting edge S4 and the cutting edge S5 are formed by forming the new rake face P2. The angle formed by the cutting edge S0 and the cutting edge S4 is a rake angle γ. In this embodiment, γ = 45 °.

  In the present embodiment, the old blade edge angle θ is set to 45 ° and the ice breaking blade 61 is inclined with respect to the traveling direction R in a side view. However, the present invention is not limited to this.

Here, the relationship between the old rake face P1 and the newly formed new rake face P2 will be described with reference to FIG. FIG. 5 is a schematic cross-sectional view taken in a direction along the traveling direction in the nose for explaining the relationship between the old rake face and the new rake face, and (a) is a newly formed new rake face. (B) shows the old rake face.
The new rake face P2 is formed with a rake angle γ = 45 ° as shown in FIG. For this reason, the cutting edge S4 formed on the new rake face P2 from the nose n is formed so as to protrude like a ridge with respect to the traveling direction R.
On the other hand, the old rake face P1 is formed with a rake angle γ = 0 ° as shown in FIG.

As shown in FIGS. 1 and 2, the cleaning nozzle 8 is disposed in the upper opening of the refrigeration drum 22 toward the blade 6. Then, cleaning water is sprayed from above the rotating blade 6 to the front and rear surfaces of the blade 6, and the powdered ice deposited on the blade 6 is washed away by the pressure of the cleaning water.
For example, the blade 6 is cleaned before and after the operation cycle of the ice grain spray device 1. For cleaning, a simple method in which cleaning water is continuously sprayed while the blade 6 rotates once can be employed.

In addition, an efficient and reliable method is adopted in which the rotational position of the blade 6 is detected, the blade 6 reaches the predetermined cleaning position, and the cleaning water is sprayed from the cleaning nozzle 8 toward the blade 6. You can also
Specifically, position detection means such as an encoder is provided, and the rotation position of the blade 6 is detected from the rotation angle of the rotating shaft 23c, and the cleaning water is injected when the blade 6 reaches the injection position of the cleaning nozzle 8. .

  A flow rate adjusting valve (not shown) for adjusting the flow rate of the cleaning water supplied to the cleaning nozzle 8 is provided in the flow path on the front side of the cleaning nozzle 8. If the flow rate of the washing water is too small, the washing ability is reduced and powdered ice remains. If the flow rate is too high, the washing water that has bounced off the blade 6 peels off the ice layer C2 formed on the inner wall 22a of the freezing drum 22 and lumps. This causes clogging of the suction hose 4 and the like.

  As shown in FIG. 1, the rotating device 23 includes a motor 23a and a speed reducer 23b serving as a driving source, a rotating shaft 23c connected to an output shaft of the speed reducing device 23b, and a bearing 23d that supports the rotating shaft 23c. It is prepared for. The blade 6 is attached to the rotating shaft 23c via a bracket 62.

  The funnel 3 has a conical shape with the large-diameter opening 3a on the top and the small-diameter opening 3b on the bottom, and collects the ice particles C3 falling from the ice making machine 2 at the large-diameter opening 3a. It is conveyed to the connected suction hose 4. The funnel 3 is made of a material such as Teflon (registered trademark) or polypropylene having a low thermal conductivity and a low friction coefficient.

A scraper 31 is held in contact with the inner wall 3 c of the funnel 3, and is configured to rotate the scraper 31 along the inner wall 3 c of the funnel 3 using the rotational force of the rotating device 23.
Specifically, an extension shaft 31 a extending from the rotation shaft 23 c of the rotation device 23 and a drive arm 31 b connecting the extension shaft 31 a and the scraper 31 are provided. Further, an adjustment mechanism 32 is provided so that the inclination angle and the pressing force of the spring 31c can be adjusted in accordance with the inclination of the inner wall 3c so that the scraper 31 is in contact with the inner wall 3c of the funnel 3 evenly.

  The high-pressure water injection nozzle 5 injects the high-pressure water W supplied from the high-pressure pump 51 from the injection port 5a. Due to the ejector effect due to the injection, the ice particles C3 are sucked from the suction hose 4, and the high pressure water W and the ice particles C3 are mixed and injected toward the work (not shown).

Then, operation | movement of the ice particle injection apparatus 1 which concerns on embodiment of this invention is demonstrated.
The ice grain spraying device 1 freezes the ice making water C1 sprinkled from the water sprinkling device 21 on the inner wall 22a of the freezing drum 22 to form an ice layer C2, and this ice layer C2 is a blade 6 having a saw-tooth ice breaking blade 61. And scrape off to produce ice particles C3. The ice breaker blade 61 is formed with a rake angle of the blade edge of −45 °.

Thus, instead of setting the rake angle γ of the cutting edge of the ice breaking blade 61 from 0 to the plus side as in the prior art, by setting γ = −45 °, the generation of powdered ice is about ½ of that in the past. Is suppressed.
That is, in the process of generating the ice particles C3 by the ice breaker blade 61, the blade tip acts like an icebreaker, and the ice layer C3 is pushed and crushed by the blade tip to generate powdered ice (powder snow) that easily accumulates. Is estimated to be suppressed.

  Further, by setting the rake angle γ to the minus side, the rake face P2 formed in a bowl shape has an effect of preventing scattering, and powdered ice (powder snow) generated simultaneously with crushed ice is removed from the inner wall 22a of the freezing drum 22. The effect of suppressing the scattering of powdered ice is also estimated.

  In addition, the cleaning nozzle 8 is disposed at the upper opening of the refrigeration drum 22 toward the blade 6 and sprays cleaning water from above the rotating blade 6 to wash away powdered ice deposited on the blade 6. It is possible to prevent a situation in which powdered ice deposited on the blade 6 gradually increases due to repeated continuous operation and becomes a lump and clogs the funnel 3 or the suction hose 4.

  Further, the scraper 31 is brought into contact with the inner wall 3c of the funnel 3 and rotated along the inner wall 3c, whereby the powdered ice deposited on the inner wall 3c of the funnel 3 can be reliably removed. For this reason, it is possible to prevent a situation in which the powdered ice deposited becomes large and becomes a lump and clogs the funnel 3 and the suction hose 4.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications.
For example, in the present embodiment, the ice breaking blade 61 has the rake angle γ of the blade edge formed at −45 °, but is not limited thereto, and the rake angle γ is in the range of −10 ° to −55 °, More preferably, it may be appropriately selected from the range of −10 ° to −45 °.

That is, in the process of generating the ice particles C3 by the ice breaker blade 61, the blade tip acts like a bite to cut and peel off the ice layer C2 with the blade tip (peeling), and the blade tip acts like an icebreaker. It is conceivable that elements (cracking) that crush and break the ice layer C2 with the cutting edge are mixed.
For this reason, when the rake angle of the blade edge is swung to the minus side, it is presumed that the factor of crushing increases and the powdered ice decreases. On the other hand, when the rake angle exceeds −55 °, the element of “peeling” is excessively reduced and the ice making efficiency is lowered.
Accordingly, the rake angle γ is appropriately set in consideration of the properties of the formed ice layer C2 and the required size of the ice particles C3.

It is a fragmentary sectional view which shows the whole structure of the ice particle injection apparatus which concerns on embodiment of this invention. It is a typical top view which shows the inside of the drum of the ice making machine which concerns on embodiment of this invention. It is a perspective view which shows the external appearance of the braid | blade which concerns on embodiment of this invention, (b) is the elements on larger scale of the ice breaking blade. (A) is a front view of the braid | blade which concerns on embodiment of this invention, (b) is a right view. It is a schematic cross-sectional view taken in the direction along the traveling direction in the nose for explaining the relationship between the old rake face and the new rake face, (a) shows the newly formed rake face, (B) shows the old rake face.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ice grain injection device 2 Ice making machine 3 Funnel 4 Suction hose 5 High pressure water injection nozzle 6 Blade 8 Cleaning nozzle 21 Sprinkler 22 Freezing drum 22a Inner wall 23 Rotating device 31 Scraper C1 Ice making water C2 Ice layer C3 Ice grain P1 Old scoop surface P2 New rake face γ Rake angle

Claims (4)

An ice making machine for use in an ice grain spraying device that blasts ice grains onto the surface of a workpiece together with high-pressure water,
A freezing drum that freezes the ice-making water sprayed from the watering device to form an ice layer on the inner wall;
A blade that has a serrated ice breaking blade, and scrapes off the ice layer with this ice breaking blade to produce the ice particles;
A rotating device that rotates the blade along the inner wall in a state where the blade is applied to the inner wall;
The ice breaking blade is formed in a range of -10 ° to -55 ° rake angle of the blade edge.   The ice making machine according to claim 1, wherein a cleaning nozzle for spraying cleaning water is disposed toward the blade. When the blade rotates, the rotation position of the blade is detected,
Detecting that the blade reaches a predetermined cleaning position,
The ice making machine according to claim 2, wherein cleaning water is jetted from the cleaning nozzle toward the blade. An ice grain spraying device having the ice making machine according to claim 1,
A funnel for collecting the ice particles produced by the ice making machine;
An ice particle jetting device characterized in that a scraper is held in contact with the inner wall of the funnel, and the scraper is rotated along the inner wall of the funnel using the rotational force of the rotating device.

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